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EXPLANATION OF THE PLATES. 
PLATE I, 
Fig. 1. Cellepora ovoidea, p. 38. 
a. The natural size, on the leaf of amarine plant. 
B. Cells magnified. 
2. Cellepora labiata, p. 39. 
a. Groups of cells, of the natural size, on afucus. 
B. Cell magnified, seen sidewise. 
C. . .in front. 
D. . . truncated. 
3. Cellepora Mangnevillana, p. 39. 
a. Of the natural size, on the Fuciis hirsutm 
of Linnseus. 
B. Cell magnified. 
4. Flusira pyriformis y p. 45. 
a. Of the natural size. 
B. Fragment of a branch, magnified, 
5. Flustra eriophora , p. 48. 
a. Groups of cells, of the natural size, on a 
fucus leaf. 
B. Cells magnified. 
6. Flustra mamillaris, p. 49. 
a. Groups of cells, of the natural size, on a 
marine plant. 
B. Cells magnified. 
